07242775 is referenced by 13 patents and cites 16 patents.

Methods and systems for generating calibrated optical pulses in a QKD system. The method includes calibrating a variable optical attenuator (VOA) by first passing radiation pulses of a given intensity and pulse width through the VOA for a variety of VOA settings. The method further includes resetting the VOA to minimum attenuation and sending through the VOA optical pulses having varying pulse widths. The method also includes determining the power needed at the receiver in the QKD system, and setting the VOA so that optical pulses generated by the optical radiation source are calibrated to provide the needed average power. Such calibration is critical in a QKD system, where the average number of photons per pulse needs to be very small—i.e., on the order of 0.1 photons per pulse—in order to ensure quantum security of the system.

Title
Optical pulse calibration for quantum key distribution
Application Number
10/706815
Publication Number
7242775 (B2)
Application Date
November 12, 2003
Publication Date
July 10, 2007
Inventor
Alexei Trifonov
Boston
MA, US
Harry N Vig
N. Billerica
MA, US
Agent
Opticus IP Law PLLC
Assignee
MagiQ Technologies
NY, US
IPC
H04L 9/00
View Original Source